Author Topic: GenComm GC7105B base station analyzer  (Read 1421 times)

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Offline Sinager

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GenComm GC7105B base station analyzer
« on: March 06, 2018, 11:04:55 am »
Hi,
I just got one at a reasonable price for my VHF & UP radio enthusiast thinkering.
While planned for the cellphone industry, it's indeed a nice instrument packed with general purpose features and I'm very satisfied of the purchase.

I understand GenComm became JDSU and eventually Viavi and through these handovers it's hard to find resources on older models.

In particular I'm after:
- firmware CD or download, in case one day reflashing is needed
- (reasonably priced) keys to unlock 2 ports VNA and bias-T functions
- any other useful information beyond what is available on Viavi website and user manual, which I found on the web.

The plan is now to run a port scan on it and see if it runs some standard OS.

Thanks for your time

Stefano IZ0MJE
Rome, Italy
 

Offline Sinager

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Re: GenComm GC7105B base station analyzer
« Reply #1 on: March 08, 2018, 11:55:53 am »
Sharing some updates

Appears to run a 2.6 kernel Linux.
There's open TELNET and FTP ports but no luck in brute forcing them via ncrack.

Next step will be to crack it open and make a disk image for backup and playing.

Connecting via usb JDView seems to work (http://sg.celladvisor.updatemyunit.net/) no luck with the other software.
 

Offline Sinager

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Re: GenComm GC7105B base station analyzer
« Reply #2 on: March 09, 2018, 09:39:52 am »
Got it open and turns out the o.s. is stored on a 2Gb SD-card: better making a backup in case it gets corrupted.
Sometimes software is protected by associating it to a specific card serial number, but there may be ways around.
Getting a clone is trivial under Linux.

Pulling out the SD-card requires removing meany screws and the SMA bolts, but you don't need to pull the board all the way out: just slide it enough to give the SD enough clearance to exit.

Now let's just hope it still works when I close it back...  :D

 

Offline Wolfsky

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Re: GenComm GC7105B base station analyzer
« Reply #3 on: March 31, 2018, 05:00:49 am »
Wow! thanks for your information! i have this too ;D ,and i also have a firmware version :JD7105B FW 4.085. looks like this machine also surpported USB-TMC protocol.
Do you have some idea hacking this machine to 7.2GHz? or unlock options ?
here is the firmware :
https://mega.nz/#!vrxGVDCR!7_S8z4Qaq4jgfKd-YK5rGs8kCxcLUnIdZA_SNCAYMsM
happy hacking!
« Last Edit: March 31, 2018, 05:35:19 am by Wolfsky »
 

Offline Sinager

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Re: GenComm GC7105B base station analyzer
« Reply #4 on: April 01, 2018, 09:32:14 pm »
Hello Wolfsky,
thank you for the reply.
Unfortunately not much progress so far, as the SD card doesn't contain a full OS image but just a few files I'm trying to understand.

I've seen the JD fw images on a couple of sites and I'm not clear yet whether the JD branded one would work without issues on the GenComm branded hardware. They look identical in pictures but specs are indeed different, with the crucial 7GHz coverage you talk about. I'll check the fw # on my unit and compare.

Will post here any update.

Cheers
 

Offline Sinager

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  • Country: it
Re: GenComm GC7105B base station analyzer
« Reply #5 on: April 01, 2018, 09:58:19 pm »
my machine shows:
model GC7105b
firmware 4.061

Is yours GenComm or JDSU branded?
 

Offline wavebits

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Re: GenComm GC7105B base station analyzer
« Reply #6 on: May 03, 2018, 05:23:38 pm »
Were you ever able to get a login to a telnet session? I have a JD746A RFanalyzer with the same Gencomm lineage and relly need to get a command propmt in order to do some diagnostics on the USB "A" host port. My unit has both "A" and "B" (client) ports. The client is working and I can connect with the JDViewer software, but the A host port does not recognize flash drives or a JDSU USB power sensor.

BTW,  did you happen to notice how the USB was being implemented internally; ie with an small USB interface chip or directly from a large chipset? I'm trying to get an idea of how difficult the hardware would be to repair if that turns out to be the issue. I did some probing and 5V is present on the port and there is about 5K ohms to ground on the two data pins so it's not a broken connector pin, unfortunately.

Thanks.
 


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